Can Orca have "Child Boards"?

I'd like for my users to be able to drill down more than Orca seems to let me.  Is there a way to implement Child Boards in Orca?

For example, my current Orca install has the following:

Fishing (Group) -- Fishing Stlyes (Forum Board) -- Topic 1

I would like to add my actual styles of fishing within the Fishing styles board like so.

Fishing (Group) -- Fishing Styles (Forum Board) -- Freshwater Fishing (Child Board) -- Topic 1

This is not possible. 
This is a missing option in Orca, its very basic forum.

Could I integrate I different type of forum software into Dolphin?  Like SMF or PHPbb?

If you use 6.1.6 then its possible to have phpbb3 intregrated, but you need there fore a modification. 
Ask eSASe for this, he is the designer of that mod.

Thanks so much!!!!

I just messaged eSASe.  This will work wonders for my Dolphin 6 installation.  I'm just hoping he's in the process of updating it for Dolphin 7 (for when I finally update).